Not sure what you mean. If you are talking about sending them in the mixture, it is best not to send the mixture with them because they can easily multiply too much and die in that small space. If they are just in water, they will just be hanging out, and not breeding or creating much waste.
Or maybe you are asking about feeding procedures? I use large yogurt type containers as my micro 'hotels' and I just use a wooden skewer to run it around the inside to scrape the sides clean each day. To feed them out, I rinse the stick off into a jar of water. Then I just leave them like that and feed them out with a dropper over the course of the day. That way there is not a load of muck going into the tank with the worms.